Grease-gun.



H. H. PRETZEL.

GRESE GUN.

MWMGANON man MAY 19, 1915 Patented Apr. 17, 1917.`

mp pm 4f www BEsrAvArLABLE @Op T'[}".`|R1VIA1\T H. PRETZEL. OF STILLWATER, MINNESOTA.

GREASE- GUN.

Application filed May 19, 1915.

To all whom it may concern.'

lle it known that l. llnuuax ll. lun'rzin.. a citizen ot' the l'nited States. residing at Stillwater. in the county oi 'ashington and State of Minnesota. have invented certain new and uset'ul Improvements in Grease- (luns, ot' which the following is a specification.

M V invention relates to improveunnts in greasel guns. designed particularly for Vtorcing grease to different parts of' automobiles. my improvements consisting particularly in means tor allowing the gun to be more easily lled with grease than in the ordinaryv construction.

rlo this end my invention consists in the features ot' construction. combination. and arrangement ot' parts hereinafter described and claimed.

In the, accompanying drawings Forming part ot' this sinwitication.

Figure 1 is a longitudinal section of a ,grease gun constructed in accordam-e with my invention: and

Fig. 2 is a central .cross section ot the Same.

As shown in Fig. 2. the gun or casing K is preferably rectangular in cross section. the closure or slide l being fitted in an opening in the top. 'lhe slide l is "formed with tongues 1 and 2. which lit into grooves T and S in the side walls ot the gun. the slide at its inner end being similarly 'formed with tongues to tit into similar grooves in the adjacent portion of the gun. rl`he opposite cud of the slide rests upon the cud wall (l ot the gun and has anti-friction contact with said wall (l, through the, strip l held pressed against the slide by the springs J. -C represents a piston or plunger through the central portion ll of which is threaded a stem D. The piston (l has anti Friction connection with the slide B through the medium of the strip ll held against the slideI by the springs l". IThe stem D is rotatable in the end of the wall (l and provided with a handlel M upon its outer end.` The cover H is provided with a handlel A.

The turning ot' the handle M will screw the. piston forwardly in the, gun to force the grease out through the opening N. lVhen it is desired to fill the gun the handle is turned to screw the piston rearwardly against the end wall G. the cover then'being Specication of Letters Patent.

Patented Apr. 17, 1917.

Serial No. 29.237.

slid outwardly until the stop -l projecting l'rom the underside olil the cover strikes the piston t. The sliding bach of the cover gives a large opening for the insertion ot the grease. i

'l claim as my invention:

l. A grease gun comprising a casing having a discharge opening in au end wall-and an entrance opening in a side wall through which the lubricant is inserted. a slidable closure for the side wall opening movable longitudinal ot' the casing. a plunger movable longitudinal in the casing for expelling the lubricant through the discharge opening thereof. and astop arranged on the Jforward end ofthe closure in the path ofthe plunger to engage the latter when the closure is moved tov opened position for preventing tui-ther opening movement ot the closure independent of the plunger whereby to always keep the space in the rear ot' the plunger closed against ingress ot' the lubricant.

'2. A grease gun comprising a casing having an vend discharge opening and a side entrance opening. a closure t'or the sido opening ot' the casing slidable from the rear in a longitudinal direction to operative position. a plunger operable longitudinaily in the casing across the. side opening, and means carried by the closure and engageable with the plunger on opening movement of said closure t'or holding the latte against uncovering the space in rear o't' said plunger.

3. A grease gun comprising a casing having a side. entrance opening the surrounding edges ot which are provided with grooves extending over the rear end wall of the casing. a closure slidable over the end wall and interlocking in the grooves about the easing opening` a plunger slidable in the easing, and spring pressed strips ou the casing end wall and the plunger. said strips extending the width ot the -elosure and vexerting outward pressure ou the closure at spaced points to firmly and evenly seat the closure on the walls ot' the grooves to provide a grease-tight joint.

Tn testimony whereof I atiixniy signature H. S. JoHNsoN, 1I. Swanson. 

